Flask



FIG. 1 is a front perspective view of a flask, according to my newdesign;

FIG. 2 is a front facing view thereof; the dashed lines of FIGS. 1 and 2representing a label, the latter of which is not part of the claimeddesign;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear facing view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The ornamental design for a flask, as shown and described.